There was some dude at the other Catholic high school in my town, who decided to have a wank in class. I never found out who it was though.
There was an old dude relief teaching and he asked what this dude was doing, he simply replied "Oh, I just had a wank."
The relief teacher was reeling, and this guy had to have a meeting with the principal and everything. But because they couldn't actually PROVE that this guy actually had a wank, so he didn't get in shit for it.
At the end of that class his cum was dripping down his leg!
I know this because I'm friends with the relief teacher's grandaughters and a few people who went to the school know about it, but nobody knows the "wanker's" real identity.
(Sorry about the stupid pun, I couldn't resist
)